Powerbank case



FIG. 1 is a front perspective view of a powerbank case;

FIG. 2 is a rear perspective view of the powerbank case of FIG. 1;

FIG. 3 is a left side view of the powerbank case of FIG. 1;

FIG. 4 is a right side view of the powerbank case of FIG. 1;

FIG. 5 is a top view of the powerbank case of FIG. 1;

FIG. 6 is a bottom view of the powerbank case of FIG. 1;

FIG. 7 is a front view of the powerbank case of FIG. 1; and,

FIG. 8 is a rear view of the powerbank case of FIG. 1.

The broken lines are for the purpose of illustrating portions of the powerbank case that form no part of the claimed design. 

CLAIM The ornamental design for a powerbank case, as shown and described. 